Vehicle-tire.



H. Z. COBB.

VEHICLE TIRE.

APPLICATION FILED JULY I7. 1914.

Lw. Patented Dee. 26,1916.

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V HENRY Z. COBB, OF WINCHESTER, MASSACHUSETTS, ASSGNOR TO REVERE RUBBECOMPANY, A CORPORATION OF RHODE ISLAND.

VEHICLE-TIRE.

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Specification of Letters Patent.

Patented Dec. 26, 1915.

Application filed July 17, 1914. Serial No. 851,438.

To all whom t may concern .Be it known that l, HENRY Z. COBB, a citizenof the United States, residing in Winchester, county of Middlesex, andState of Massachusetts, have invented certain new and usefulimprovements in Vehicle-Tires, of which theJ following is a full, clear,and exact disclosure.l

My invention relates particularly to vehicle tires made of elasticmaterial, and is more particularly applicable to rubber or elastictiresv of the pneumatic type.

rlhe object of my invention is to embody in a tire a material which willnot only increase the wearing qualities of the tire, but will alsoproduce an antiskidding or antislipping effect.

Broadly, my invention comprises embedding in the projecting lugs ofnon-skid tire casings, cores or plugs made of a compositefabriocomprising strands of fibrous material interbraided or interwovenwith strands of metal in the form of wire or wire filaments so as torigidly hold said wires in position within' the material of the tire.

A further feature of my invention cornprises such adisposition of thematerial within the tread portion of the tire that the wire will bepresented to the road surface at va substantially right angle to thesame so that the ends of the wires will form sharp burs which increasethe frictional resistance between the road surface and the tire and inconjunctionwith the action of' studs or lugs prevent skidding orslipping to a much greater extent. I

rlhis form of my invention is a particular adaptation of my inventiondescribed in an application filed by me in the United States PatentOffice on June 20,1914, Serial No. 846,245, and relates particularly totires now on the market having projecting studs of `.rubber arranged onthe tread portion for producing antiskidding or antislipping action.

For a detailed description of one form of my invention reference may behad to` the following specification and to the accompanying drawingsforming a part thereof, in which:

Figure 1 is a perspective view of a portion of a tire having my improvedantiskidding plugs embodied therein; Fig. 2 is a transverse sectionalview of the same; Fig. 3 is a perspective view of one of the cores ofthe studs showing the method by which they are formed; Fig. 4 is atransverse sectional. view taken substantially on the line #A, Fig. 6,showing the core inserted in one of the studs on the tread portion of atire; Fig. 5 is a plan view of the same before the outer surface of thestud and core is worn away; Fig. 6 is a plan view of the same, Vshowingthe effect of wear on the outer surface of the stud and core; Fig. 7 isa perspective view showing another method of forming the core; and Fig.8 is a perspective View showing the method of roughening the cores togive a stronger connection wih the rubber of the tread.

Referring to Figs.1 and 2, it will be seen qthat the tire casing is inthe usual form` and is provided with successive series of inclinedelongated studs 1,. this being a well known form of tire now on themarket. In my improved construction, the centers of these studs areprovided with cores 2 made up of a composite material consisting of wirestrands and interlaced fibrous strands treated with rubber to firmlyanchor the wires in position. rlhis material comprises a compositefabric which is preferably manufactured in accordance with thedescription set forth in my application filed in the United StatesPatent Office on J une 20, 1914, Serial No. 846,245. lt consists in themain of longitudinal warp strands of wire, either single wires oraseries of braided or twisted wire filaments which are preferably coveredor wound 'with fibrous threads to form strands similar to those known inthe electrical art 'as insulated wire. These wire strands are interwovenor braided with transversely extending fibrous strands which make up thecomposite fabric referred to. rFhese cores may be made in a number ofdifferentways, one of which is. indicated in Fig. 3, in which the stripsof the fabric, preferably impregnated with rubber, are crimped insuccessive layers and then forced together so as to form a substantiallysolid block 2 having projecting flanges or lips 3. These blocks 2 arepreferably inserted through corresponding holes in the so-called I' thefact that the breaker strip lpasses about the flanges or lips 3, thestuds are not only held firmly in position on the carcass, but the treadportion of the tire is more lirmly united with the said carcass.

As shown in Fig. 7, the fabric instead of being crimped into form, maybe rolled l spirally into the desired shape, either.With

or Without extending llanges or lips, but When the latter are not used,the studs of the blocks may be roughened or fluted, as incourse, isaided to a large: extent by reason of' the iact that connecting strandsof fibrous yarn are ualso presented endWise to the road surface. Both ofthese materials have much greater Wearing qualities than that of therubber itself. The Wire strands being interwoven With the, brous strandsand irmly united ,therewith by the rubber with which the fabric isimpregnated, there will' be practically no possibility of the Wiresbeing displaced or pulled out, While vat the ksaine timel the core isrigidly held in position and prevented from becoming loosened by thegreat strains to which such studs are subjected during travel .of theautomobile over the road surface. Furthermore, the

. remote antiskidding action of the studs is many times increasedbecause the outer ends of the Wires Will protrude slightly beyond therubber and so directly engage the r'oad surface, especially on verysmooth and slippery pavement, such las asphalt, concrete,

etc. rlhus it' will be seen that an atislcidding action is produced`which is edective on different sorts of road surfaces, the studsthemselves acting Where the surface is some- What soft and slippery,While the Wires et the cores act Where the surface is slippery but hardand smooth. A Having thus described this form of my invention, What lclaim, -to protect byA Letters tatent is:

ln a vehicle tire, the combination with a series of projecting studs orlugs, cores for said studs radially disposed therein comprising acomposite material having successive layers of intimately interwovenlibro-us transverse binding strands and Wire, said layers being bent toform laterally projecting flanges atthe bases of said cores andprojecting beneath the bases of said studs Within the material of thetire.

Signed at Chelsea State of Mass. this 7th day oi July 1914. l

. HENRY Z. COBB.

litnesses: j WILLIAM Greases, lnWrN L. S'ricnnnr.

